renew_tokens

THE RISK

Low Risk

Why renew_tokens needs a policy

The name 'renew_tokens' suggests refreshing authentication tokens, which is a Write/credential-management operation with no financial or destructive implications. However, the description is empty, so confidence is low.

From the tool's definition Tool name 'renew_tokens' — description is empty and uninformative.

Documented attack patterns abuse exactly the kind of access renew_tokens gives an agent:

POLICY

How to control renew_tokens

PolicyLayer is an MCP gateway — it sits between your AI agents and MinerU MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for renew_tokens:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "renew_tokens": {
      "limits": [
        {
          "counter": "renew_tokens_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

renew_tokens gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register MinerU MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 6 MinerU MCP Server tools →

Other tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about renew_tokens

What does the renew_tokens tool do? +

renew_tokens. It is categorised as a Other tool in the MinerU MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on renew_tokens? +

Register the MinerU MCP Server MCP server in PolicyLayer and add a rule for renew_tokens: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MinerU MCP Server. Nothing to install.

What risk level is renew_tokens? +

renew_tokens is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit renew_tokens? +

Yes. Add a rate_limit block to the renew_tokens rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block renew_tokens completely? +

Set action: deny in the PolicyLayer policy for renew_tokens. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides renew_tokens? +

renew_tokens is provided by the MinerU MCP Server MCP server (neosun100/mineru-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MinerU MCP Server tool call.

Start from MinerU MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →